Hi All, Blackholes will curve the space-time in a way so that even particles moving with speed of light are trapped. It's presence is detected by the gravitational force it exerts. So if there were particles like gravitons which would defenitely travel less than or equal to 'c', those also would have been trapped. So how exactly the gravitational force is exerted? If it was with particles like gravitons, it should move faster than light. If there are no particles, gravity can be instantaneous, because there is nothing to limit it, there by violating principle of relativity. Or if there are gravitons which travels at 'c', there can be lot of mass whose presence can never be proved and our understanding of universe is wrong as far as with matter density... Can anyone explain me where I went wrong in these wild thoughts? Thanks in advance, Kannan Kailas.